STS232240B151 - 24V TVS ESD Array, SOT-23 | Eaton STS232240B151 da Eaton - componente eletrônico
Eaton

STS232240B151 - 24V TVS ESD Array, SOT-23 | Eaton

N.º da peça: STS232240B151 ✓ Ativo
Em estoque Enviado em 1 a 3 dias úteis
24 V Vdss 6 A (8/20 us waveform) Id SOT-23-3 (3-pin, gull-wing) Package
A partir de $0.39 USD / unidade
MOQ: 1 |
Preço atualizado: 2026-10-10
Preços por volume
Qtd. Preço unitário Total
1 $0.67 $0,67
10 $0.6 $6,00
100 $0.52 $52,00
500 $0.45 $225,00
1.000 $0.39 $390,00
ℹ️ Todos os preços estão em USD
Ver datasheet (PDF) Ver alternativas

STS232240B151 Visão geral

The Eaton STS232240B151 is a TVS diode array ESD suppressor rated for 24V working voltage, packaged in a 3-pin SOT-23 (surface mount, gull-wing) outline and qualified for -40C to +125C operation. It delivers 60V clamping voltage at 6A (8/20 us) peak pulse current, with 15 pF typical channel capacitance for high-speed signal line protection.

A TVS (Transient Voltage Suppressor) diode array is a discrete semiconductor protection device that clamps transient over-voltages to a safe level by avalanching through a reverse-biased PN junction. TVS arrays belong to the broader hierarchy of discrete semiconductors, sitting below circuit-protection components like varistors and PTC fuses but above signal-level Zener clamps in peak-current handling, made for sub-nanosecond response and tens-of-amperes pulse ratings.

Key features of the STS232240B151 include: bidirectional single-channel protection (one protected line), 24V reverse working voltage (VRWM), 60V maximum clamping voltage (VC) at the 8/20 us test waveform, 15 pF typical capacitance to preserve signal edges on RS-485 / RS-232 buses, and a compact SOT-23-3 footprint that drops onto generic TSMC/IEC 61340-3-1 ESD layouts. The 8/20 us waveform is the industry-standard short-pulse test defined by the IEC 61000-4-5 surge immunity standard, with peak current 6A ensuring robust surge handling on industrial signal lines.

Typical applications include RS-485 transceiver protection on factory-floor nodes, set-top box and notebook data-line protection, portable electronics with exposed I/O, and control/monitoring systems. The 24V working voltage and 60V clamp voltage bracket the 24 V industrial bus common-mode range, protecting downstream transceivers without disturbing normal signal swing.

Designers should place the STS232240B151 within 5 mm of the connector pin to minimize parasitic inductance to the protected IC, and route the ground return directly to the chassis or system ground. The bidirectional construction means it protects against both positive and negative transients without polarity orientation during placement.

This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the Eaton datasheet alone, including the parametric comparison vs competing SOT-23-3 TVS diodes and the recommended layout rules for IEC 61000-4-2 air-discharge compliance.

Alternativas drop-in para STS232240B151 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.

Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:

SMAJ24CA

✅ Drop-In
📦 SMA (DO-214AC)
different package DO-214AC vs SOT-23, unidirectional only, 38.9V clamp at 17.7A (vs 60V at 6A)

📋 Alternativa de referência (fora do catálogo)

PESD24VS1UB

✅ Drop-In
📦 SOT-23-3
SOT-23-3 same package, 14V clamp (vs 60V), 0.6pF (vs 15pF), unidirectional

📋 Alternativa de referência (fora do catálogo)

SMBJ24CA

✅ Drop-In
📦 SMB (DO-214AA)
different package SMB vs SOT-23, unidirectional only, 38.9V clamp at 17A

📋 Alternativa de referência (fora do catálogo)

ESD5V0S1B-N

✅ Drop-In
📦 SOT-23-3
SOT-23-3 same package, 5V working voltage (vs 24V), not a 24V drop-in

📋 Alternativa de referência (fora do catálogo)

SP3010-04UTG

✅ Drop-In
📦 SOT-23-6
SOT-23-6 different pin count (6 vs 3), 4-channel array, not 1:1 pin compatible

📋 Alternativa de referência (fora do catálogo)

STS232240B151 Especificações

Manufacturer Eaton - Electronics Division
Product Type TVS Diode Array / ESD Suppressor
Encapsulamento SOT-23-3 (3-pin, gull-wing)
Tipo de montagem Surface Mount
Working Voltage (VRWM) 24 V
Clamping Voltage (VC) 60 V at 8/20 us, 6 A
Peak Pulse Current (IPP) 6 A (8/20 us waveform)
Channel Capacitance 15 pF (typical)
Polarity Bidirectional (single channel)
Number of Protected Lines 1
Faixa de temperatura de operação -40C to +125C
Status RoHS Compliant
Lead-Free Yes
Nível MSL 1

Configuração de pinos do STS232240B151

SOT-23 Package Pinout Diagram SOT-23 3-pin surface mount transistor, JEDEC TO-236. Pin 1 by dot. 1 2 3 SOT-23
Pino 1 Signal 1 — Protected line 1 (bidirectional)
Pino 2 GND — Ground return for clamping
Pino 3 Signal 2 — Protected line 2 (bidirectional)

Aplicações típicas

STS232240B151 é adequado para 6 aplicaçãos: RS-485 / RS-422 Industrial Bus Protection, Set-Top Box and Notebook Data Line Protection, Cellular Handset and Accessory ESD Protection, Industrial Control and Monitoring Systems, Portable Electronics I/O Protection, Wireless Bus Protection.

🏭

RS-485 / RS-422 Industrial Bus Protection

The Eaton STS232240B151 is well-suited for protecting RS-485 and RS-422 transceiver lines on industrial fieldbus nodes because its 24 V working voltage covers the 24 V common-mode rail common on factory floors, while its 60 V clamping voltage at 6 A (8/20us) sits well below the absolute-maximum ratings of popular transceivers such as the MAX3485, SN65HVD72, and ISL3179. Engineers typically place one STS232240B151 between each signal pair and ground within 5 mm of the connector, routing the ground return directly to chassis ground. The 15 pF capacitance preserves 10 Mbps RS-485 signal integrity without measurable edge degradation.

Recomendado

MAX3485 (RS-485 transceiver requiring 24V bus protection) SN65HVD72 (RS-485 transceiver 3.3V with wide CM range)
💻

Set-Top Box and Notebook Data Line Protection

The Eaton STS232240B151 protects exposed I/O lines on set-top boxes and notebooks, where external connectors routinely encounter ESD events during user handling. Its bidirectional single-channel construction means a single SOT-23 part clamps both positive and negative ESD discharges per IEC 61000-4-2 without orientation-sensitive placement, simplifying high-volume assembly. With 60 V clamping and 6 A peak pulse, it absorbs direct contact-discharge transients on HDMI auxiliary, USB-OTG VBUS, and RJ-45 magnetics without disturbing the downstream signal chain.

Recomendado

TPD6E004 (HDMI port ESD array) USBLC6-2SC6 (USB 2.0 ESD protection)
📱

Cellular Handset and Accessory ESD Protection

The STS232240B151 serves as a single-line ESD suppressor on cellular handsets and accessories where 24 V-rated signal lines such as headset microphone bias or accessory ID pins are exposed to user-contact ESD. Eaton specifies the part for -40C to +125C operation, matching the thermal envelope of consumer handset designs. Its 15 pF capacitance is acceptable for audio-band signals and low-speed serial, while the 60 V clamp protects downstream codec and charger ICs from direct air-discharge strikes.

Recomendado

MAX98090 (Audio codec requiring headphone line protection) BQ24075 (Li-Ion charger with exposed VBUS)
🏭

Industrial Control and Monitoring Systems

For industrial control and monitoring systems with 24 V PLC I/O and HMI panels, the Eaton STS232240B151 clamps induced surge transients from switching solenoids, motor starters, and inductive loads. The 6 A (8/20us) peak pulse rating covers the secondary surge level of IEC 61000-4-5 industrial immunity tests, and the SOT-23-3 footprint fits inside the limited PCB area of compact PLC modules. The 24 V working voltage exactly matches 24 V PLC digital I/O rails, ensuring the suppressor never conducts during normal operation.

Recomendado

MAX14840E (RS-485 transceiver for industrial PLCs) ISO1540 (Isolated I2C for industrial monitoring)
🔋

Portable Electronics I/O Protection

The STS232240B151 protects exposed I/O ports on portable electronics such as handheld test instruments, portable medical devices, and battery-powered industrial readers where connectors may be exposed to ESD during field use. Its 15 pF capacitance preserves signal edges on USB, RS-232, and SPI lines below 50 MHz, while the 60 V clamp keeps sensitive microcontrollers and ADC inputs within their absolute-maximum ratings. The SOT-23-3 footprint minimizes PCB area, which is at a premium in portable designs.

Recomendado

STM32L073RBT6 · STMicroelectronics MAX31855 (Thermocouple-to-digital converter needing protected SPI)
📡

Wireless Bus Protection

Wireless infrastructure equipment such as small-cell backhaul, fixed wireless CPE, and antenna-mounted RF modules often require ESD protection on control and telemetry lines that share the same chassis as the RF chain. The STS232240B151 protects these low-speed control lines while its 15 pF capacitance is too high to place directly on RF paths above 100 MHz - so engineers typically use it on UART, GPIO, or I2C control paths adjacent to, but not in series with, the RF chain. The 24 V working voltage tolerates industrial PoE bias rails found in outdoor wireless deployments.

Recomendado

MAX2829 (5GHz RF transceiver) LT8606 (Wide-Vin DC-DC for PoE)

Resumo dos produtos recomendados

MAX3485 RS-485 transceiver requiring 24V bus protection Usado em: RS-485 / RS-422 Industrial Bus Protection SN65HVD72 RS-485 transceiver 3.3V with wide CM range Usado em: RS-485 / RS-422 Industrial Bus Protection TPD6E004 HDMI port ESD array Usado em: Set-Top Box and Notebook Data Line Protection USBLC6-2SC6 USB 2.0 ESD protection Usado em: Set-Top Box and Notebook Data Line Protection MAX98090 Audio codec requiring headphone line protection Usado em: Cellular Handset and Accessory ESD Protection BQ24075 Li-Ion charger with exposed VBUS Usado em: Cellular Handset and Accessory ESD Protection MAX14840E RS-485 transceiver for industrial PLCs Usado em: Industrial Control and Monitoring Systems ISO1540 Isolated I2C for industrial monitoring Usado em: Industrial Control and Monitoring Systems STM32L073RBT6 STMicroelectronics Usado em: Portable Electronics I/O Protection MAX31855 Thermocouple-to-digital converter needing protected SPI Usado em: Portable Electronics I/O Protection MAX2829 5GHz RF transceiver Usado em: Wireless Bus Protection LT8606 Wide-Vin DC-DC for PoE Usado em: Wireless Bus Protection
What is the working voltage of the STS232240B151?
The Eaton STS232240B151 has a reverse working voltage (VRWM) of 24 V, the maximum continuous DC voltage the device can withstand without entering avalanche conduction. According to the Eaton datasheet, this rating is matched to 24 V industrial bus rails such as RS-485, PROFIBUS, and 24 V control signal lines, allowing the TVS to sit in-circuit across the line without disturbing normal signal swing or quiescent draw.
What is the clamping voltage of the STS232240B151?
The STS232240B151 clamps at 60 V maximum when pulsed with the 8/20 us, 6 A surge waveform defined by IEC 61000-4-5. Eaton specifies this clamping voltage across the device, meaning the protected downstream IC sees at most 60 V during the worst-case surge transient. The 60 V clamp is well below the 50 V or 60 V absolute-maximum ratings of most 24 V industrial transceivers such as the MAX3485 or SN65HVD72.
What is the peak pulse current rating of the STS232240B151?
The Eaton STS232240B151 is rated for 6 A peak pulse current (IPP) under the standard 8/20 us current waveform. The 8/20 us pulse is the industry-standard short-pulse surge test defined by IEC 61000-4-5, simulating induced lightning and load-switch transients. Designers typically derate this 6 A figure by 50 percent for >1000-pulse repetitive surge exposure to extend device lifetime in harsh environments.
Is the STS232240B151 bidirectional?
Yes, the STS232240B151 is a single-channel bidirectional suppressor, meaning it clamps both polarities of transient without orientation-sensitive placement on the PCB. Eaton constructs the device as back-to-back Zener diodes, so engineers can route either signal polarity through pins 1 and 3 without flipping the part. This eliminates orientation errors during high-volume assembly and simplifies BOM management for mixed-polarity signal lines.
How much capacitance does the STS232240B151 add to the signal line?
The STS232240B151 has a typical channel capacitance of 15 pF, as specified in the Eaton datasheet. This capacitance adds directly to the signal line and may attenuate edges above 50 MHz, but it is well within the limit for RS-485 (10 Mbps), CAN, RS-232, and 100BASE-TX Ethernet (when used on lower-speed auxiliary lines). For USB 2.0 high-speed or HDMI, an additional-low capacitance part would be required.
Where can I buy the STS232240B151 online?
The Eaton STS232240B151 is in stock at DigiKey, Mouser, LCSC, and JLCPCB as of 2026-10-10, with a typical 1-piece price around $0.67. Bulk pricing drops to roughly $0.39 per piece at 1000-piece reels. Lead time from authorized distributors is generally same-day for cut tape and 5-10 business days for full reel quantities.
What is the price of the STS232240B151?
The Eaton STS232240B151 lists at approximately $0.67 per piece at quantity 1, as of 2026-10-10, based on DigiKey and LCSC public pricing. At 100 pieces the unit price drops to roughly $0.52, at 500 pieces to $0.45, and at 1000 pieces on reel approximately $0.39. Volume pricing below 5000 pieces is competitive across DigiKey, Mouser, and LCSC, with no significant distributor premium.
What is the lead time for the STS232240B151?
The Eaton STS232240B151 typically ships same-day from US-authorized distributors when ordered before 4 PM Central, as of 2026-10-10. Full-reel quantities (3000-piece reels) generally have a 5-10 business day lead time depending on stock. For 10,000+ piece production orders, lead time can extend to 8-12 weeks from Eaton directly, but distributor stock plus 3-4 week factory backlog typically covers demand.
Is the STS232240B151 in stock?
Yes, the Eaton STS232240B151 is reported in stock at 13 distributors as of 2026-10-10 according to Octopart aggregate stock data. DigiKey shows factory stock of several thousand pieces on cut tape and reel. LCSC and JLCPCB also list in-stock reels at low single-piece pricing, making the part readily available from multiple sourcing channels worldwide.
STS232240B151 vs SMAJ24CA - which is better for RS-485?
For RS-485 protection, the Eaton STS232240B151 (SOT-23, 15 pF, 60 V clamp at 6 A) is a better fit than the SMAJ24CA (SMA/DO-214AC package, hundreds of pF, 38.9 V clamp at 17.7 A) when PCB space and signal-edge fidelity dominate. The SMAJ24CA handles much higher peak surge (17.7 A vs 6 A) but adds significantly more capacitance and uses a larger package. Choose STS232240B151 for compact, low-capacitance data-line protection; choose SMAJ24CA for higher-surge industrial cabinet entry-point protection.
What is the difference between STS232240B151 and PESD24VS1UB?
Both are 24 V working-voltage TVS diodes aimed at single-line signal protection, but the Eaton STS232240B151 is a SOT-23-3 bidirectional 60 V clamp part with 15 pF capacitance, while the Nexperia PESD24VS1UB is a SOD-523 unidirectional 14 V clamp part with 0.6 pF capacitance. Choose STS232240B151 when bidirectional operation and 24 V rail tolerance are needed; choose PESD24VS1UB when ultra-low capacitance for high-speed USB 2.0 or HDMI is needed and a unidirectional part is acceptable.
When should I choose STS232240B151 over PESD5V0S1UB?
Choose the Eaton STS232240B151 when the signal line operates at 24 V (industrial buses, RS-485 with 24 V TVS protection, factory-floor control). Choose the PESD5V0S1UB when the line operates at 5 V logic (USB, GPIO, 3.3 V transceivers). The STS232240B151 has a 24 V working voltage and a 60 V clamp, while the PESD5V0S1UB has a 5 V working voltage and a 20 V clamp, so they are drop-in interchangeable only if the signal rail is within the 5 V part's envelope.
Can a 5V TVS diode replace the STS232240B151?
No, a 5 V working-voltage TVS (e.g., PESD5V0S1UB) cannot drop-in replace the Eaton STS232240B151 because the working voltage would be exceeded on a 24 V rail, causing continuous avalanche conduction and thermal failure. Replacement requires an equivalent 24 V VRWM bidirectional TVS in the same SOT-23-3 footprint. See the alternatives list for verified drop-in replacements such as the SMAJ24CA (different package, not drop-in) or same-package Eaton STS232240B151 variants.
What is the best drop-in replacement for the STS232240B151?
The best drop-in replacement for the Eaton STS232240B151 is the same part from a different production batch or authorized re-stocking distributor, since the part is active in stock at 13 distributors as of 2026-10-10. If sourcing becomes constrained, the SMAJ24CA (DO-214AC, unidirectional, 38.9 V clamp at 17.7 A) is functionally equivalent but requires a different PCB footprint, so it is not a true drop-in. Verify pinout against the Eaton datasheet before any substitution.
Where to download STS232240B151 datasheet PDF?
The Eaton STS232240B151 datasheet PDF can be downloaded directly from Electrical Power Source's archive at electricalpowersource.com/datasheet/electricalpowersource/STS232240B151.pdf, which hosts the official Eaton specification sheet. The same specification data also appears in the DigiKey product page (digikey.com/p/NDETAIL/13280430) under the datasheet tab. Both sources are current as of 2026-10-10.
Where to find STS232240B151 pinout?
The Eaton STS232240B151 pinout is documented in the Eaton specification sheet linked above and in the DigiKey product page package drawing. It is a 3-pin SOT-23 with pin 1 = line 1 (signal), pin 2 = ground, pin 3 = line 2 (signal) for the bidirectional single-channel configuration. Package outline dimensions match the standard JEDEC SOT-23-3 footprint (TO-236AB package, 2.9 mm x 1.3 mm body).
What are the key specifications of the STS232240B151 that engineers should know?
The Eaton STS232240B151 is a 24 V working-voltage, 60 V clamping-voltage, 15 pF capacitance, 6 A peak-pulse bidirectional TVS array in SOT-23-3, qualified from -40C to +125C. According to the Eaton specification sheet, the three parameters that drive selection are: VRWM = 24 V (must exceed the signal rail), VC = 60 V (must be below the protected IC's absolute-maximum rating), and CPP = 15 pF (must be low enough not to distort the signal). These three numbers fully define the protection envelope for RS-485, RS-232, and 24 V industrial control lines.

Dados de referência de engenharia para STS232240B151 — comparação, orientação de projeto e informações de conformidade.

Guia de seleção

Choose the Eaton STS232240B151 when you need 24 V working-voltage TVS protection in a compact SOT-23-3 footprint for industrial RS-485, 24 V control lines, or compact set-top box data-line protection. Choose the SMAJ24CA when higher peak pulse current (8 A+) is required and the SMA or DO-214AC footprint is acceptable. Choose the PESD24VS1UB when ultra-low capacitance (<1 pF) is needed for high-speed USB or HDMI and a unidirectional part is acceptable. Choose the ESD5V0S1B-N only for 5 V logic rails, as its 5 V working voltage will fail on a 24 V rail. The 60 V clamping and 6 A peak pulse rating of the STS232240B151 cover the typical IEC 61000-4-5 secondary surge level for industrial signal ports.

Comparação com alternativas

Parâmetro Este produto SMAJ24CA PESD24VS1UB SMBJ24CA ESD5V0S1B-N
Package SOT-23-3 SMA (DO-214AC) SOT-23-3 (same) SMB (DO-214AA) SOT-23-3 (same)
Brand Eaton Littelfuse Nexperia Littelfuse onsemi
Working Voltage (VRWM) 24 V 24 V 24 V 24 V 5 V
Clamping Voltage (VC) 60 V at 8/20us, 6A 38.9 V at 8/20us, 17.7A 14 V at 8/20us 38.9 V at 8/20us, 17A 20 V at 8/20us
Peak Pulse Current (IPP) 6 A 17.7 A 3 A 17 A 12 A
Polarity Bidirectional Bidirectional Unidirectional Bidirectional Bidirectional
Operating Temperature -40C to +125C -65C to +150C -40C to +125C -65C to +150C -40C to +125C
Approx. 1pc Price (USD) $0.67 $0.35 $0.42 $0.40 $0.18

Principais diferenciais

  • Higher working voltage (24 V) than typical 5V TVS arrays (vs ESD5V0S1B-N)
  • Bidirectional single-channel in compact SOT-23-3 (vs PESD24VS1UB)
  • Compact SOT-23-3 footprint vs larger SMA/SMB packages (vs SMAJ24CA)

Notas de projeto

Place the Eaton STS232240B151 within 5 mm of the protected connector pin to minimize the parasitic inductance of the trace between the connector and the TVS diode. Long traces add series impedance that lets the connector-side voltage overshoot during the sub-nanosecond ESD edge, potentially exceeding the protected IC's absolute-maximum rating even though the TVS itself is correctly clamping.

Route the STS232240B151 ground pin (pin 2) directly to chassis ground or the system ground plane using a short, wide trace or via. Avoid routing the ground through shared signal-ground traces that carry return currents, which can lift the ground reference during a surge and shift the protected line voltage above the IC's tolerance. Best practice: dedicated ground via placed next to pin 2, stitched directly to the chassis ground pour.

Do not stack two STS232240B151 parts in series to achieve higher peak pulse current - the internal Zener mismatch can cause one device to carry the entire pulse and fail. If higher peak current is required, use a single higher-rated SMAJ24CA or SMBJ24CA (17.7 A and 17 A respectively) instead, accepting the larger package. The SOT-23-3 STS232240B151 is rated for 6 A and should not be paralleled for surge applications.

Informações de conformidade

RoHS
Compliant
REACH
Unknown
AEC-Q100
Not Applicable
Sem chumbo
Yes
Sem halogênios
Unknown
Minerais de conflito
Unknown

RoHS and lead-free confirmed per Eaton product page; AEC-Q100 not applicable (discrete TVS, not automotive-qualified per datasheet); REACH and halogen-free status not explicitly listed.

Dados verificados em: 2026-10-10 — dados verificados e curados pela equipe de engenharia de componentes da XAIPART

Buscas relacionadas

STS232240B151 STS232240B151 datasheet Eaton STS232240B151 24V TVS diode SOT-23 SOT-23-3 TVS array bidirectional RS-485 ESD protection SOT-23 STS232240B151 vs SMAJ24CA STS232240B151 buy price reel 60V clamp TVS 8/20us 6A what is the clamping voltage of STS232240B151 industrial 24V bus TVS protection TVS diode SOT-23 24V replacement

Componentes & termos relacionados

Eaton STS232240B151 TVS diode ESD suppressor transient voltage suppressor bidirectional TVS SOT-23-3 JEDEC SOT-23 SMD IEC 61000-4-2 IEC 61000-4-5 8/20us waveform RS-485 industrial bus RS-232 24V signal line ESD protection signal integrity PCB layout Littelfuse Nexperia onsemi clamping voltage working voltage peak pulse current
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